Performance-based assessment of concrete resistance to leaching
Performance-based assessment of concrete resistance to leaching
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DOI：
10.1016/j.cemconcomp.2011.02.002
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发表时间：
2011-04
影响因子：
10.5
通讯作者：
E. Rozière;A. Loukili
中科院分区：
文献类型：
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作者：
E. Rozière;A. Loukili
当混凝土结构浸泡在纯净或矿化度较低的水和酸性环境中时，混凝土中的钙和水合物很可能会渗出。基于性能的测试可用于为此类暴露设计混凝土，前提是该测试具有代表性、敏感性和可重复性。在试验研究中，对6个振动混凝土混合料和5个不同骨料类型、水胶比和矿物掺合料的自密实混凝土混合料进行了淋滤试验，这些矿物掺合料包括粉煤灰、磨细高炉矿渣和石灰石填料。考虑到石灰石骨料，有两个指标被用来评估受损深度。掺入20%~30%粘结剂的飞灰和60%的矿渣可显著改善混凝土的性能，但浸出率随石灰石填充量的增加而增加。
Leaching of calcium and hydrates from concrete is likely to occur when concrete structures are immersed in pure or poorly mineralised water and acid environments. A performance-based test may be used to design concrete for such exposures, provided that it is representative, sensitive, and repeatable. In the experimental study a leaching test was performed on six vibrated concrete mixtures and five self-compacting concrete mixtures, varying aggregate type, water/binder ratio and mineral admixtures, such as fly ash, ground granulated blast-furnace slag and limestone filler. Two indicators have been used to assess damaged depth, taking limestone aggregates into account. Fly ash (20–30% of binder) and slag (60%) significantly improved behaviour of concrete, whereas leaching rate increased with an increase in limestone filler content.